My friend is a personal trainer and said a lot of people get injuries from using these sorts of equipment. Usually neck as has been mentioned. She also said that you actually dont burn as much 'fat'/tone as you would doing traditional exercises eg crunches. Using this equipment wont necessarily take from abs iykwim. The best she finds for abs is actually what they call the plank/bridge.
Ive never tried them though i just trust what she says though.




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